Idler B Verified
RL environment company · Coding
- Domains
- Coding Enterprise Workflows Long-Horizon
- On X
- @idler_ai ↗
- Funding
- Y Combinator S25 · rounds and investors
- Tier
- B why
- Snapshot
What Idler does
Idler builds reinforcement learning environments and evals from real production work for frontier AI labs, spanning coding, law, cybersecurity and enterprise tasks.
- Sells
- RL environments
- Leads with
- Coding
- Based in
- San Francisco, USA
- Team
- 11-25
- Website
- idler.ai ↗
What Idler sells
Read from Idler's own website, checked October 11, 2026: the line that puts it in each category.
RL environments
“Reinforcement learning environments built from real production work”
idler.ai/ ↗“own the entire system that turns our partners’ real work into evals & RL environments.”
idler.ai/careers ↗
Domains Idler covers
Coding leads with
“Frontier Coding·Economically Valuable Workflows·Bespoke Evaluations”
idler.ai/ ↗“we’re scaling our environment production across coding, RSI, law, cybersecurity, and enterprise use-cases.”
idler.ai/careers ↗“we’re scaling our environment production across coding, RSI, law, cybersecurity, and enterprise use-cases.”
idler.ai/careers ↗“We focus on RL environments that teach economically valuable work.”
idler.ai/careers ↗
Benchmarks Idler built or runs
ShelfLife built it
“We created a digital twin, ShelfLife, of a live e-commerce company.”
idler.ai/collections/shelflife ↗
Idler competitors and alternatives
The companies that sell the most of the same things in the same domains, and what they share with Idler.
- Datacurve Also sells RL environments and evals · also in coding, security and enterprise work
- Proximal Also sells RL environments and evals · also in coding and security
- Revelo Also sells RL environments and evals · also in coding and security
- Abundant Also sells RL environments and evals · also in coding
- Bespoke Labs Also sells RL environments and evals · also in coding
Tier B
Growing: 11 to 50 people, or $3M+ raised.
How much stands behind a tier: usage, who backs it, a confirmed line from its own site or paper, and a clear read on X. High with three of the four, medium with two, low otherwise.
- team 11-50
- raised $9M
- investors: Paradigm, Y Combinator
- went through Y Combinator Summer 2025
- in curated RL directories (5 pts)
How we got to tier B
- Adoption: team 11-50; raised $9M; investors: Paradigm, Y Combinator; went through Y Combinator Summer 2025. Tier B.
- On X: unclear, none buzz No move.
- In curated RL directories: 5 points, a floor of C.
- Confirmed: a line from its own site or paper places it.
A clear view on X moves a tier one step up or down; most entries don't move. How tiers work.
Idler funding
- Accelerator
- Y Combinator S25
Backed byY Combinator Summer 2025
Accelerator
- Y Combinator Summer 2025
- Y Combinator's company directory lists idler with the website idler.ai, in its Summer 2025 batch
- Checkable on YC's page: ycombinator.com/companies/idler
- 1 page read also names Y Combinator
Every figure is quoted from its own site, its accelerator or a funding announcement; a round's amount and lead appear only when its quote states them. Startup databases are never used as evidence. Checked 2026-10-11. How funding is checked.
Where Idler sits
Its domain on the map, live. Hover a logo for its name; click to open it. Open it on the full map
Latest from Idler on X
@idler_ai ↗Next: browse all environments. Entry from the RL Research daily scrape of public sources, 2026-11-05 snapshot.